Tbf in my experience anyone who talks about an idea or practice a lot is doing it precisely because they're so bad at it and want to improve.

I talk about productivity stuff a lot because I'm a hilariously terrible worker who can barely finish anything. https://twitter.com/evan__ross/status/1325494621074382848

This is probably especially true in mental domains that take constant work like mindfulness.

The advice is more useful because the person delivering it struggles with it so much themselves and they're sharing what's helped them improve.

But also Seneca was definitely writing all that stuff about being happy with nothing so his army of slaves didn't kill him